The Guardian

The Guardian is a United Kingdom news website that publishes international news, sport and opinion journalism for readers in the United Kingdom and worldwide. Its reporting is organized around the categories of news and sport, and reaches audiences through web, audio, video and email channels, reflecting a multi-format approach to how stories and coverage are delivered day to day.

Advertising on the site runs across all four of those channels: web, audio, video and email. The site's ads.txt file lists 41 ad system lines in total, made up of 29 sold directly and 27 sold through resellers, an approach that mixes direct and reseller ad systems.